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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d082a62b3a3acbb5f38db3c177967ae617c48082cf0ae315697d1e3fd78cdd2' 
  AND token = '5bqiPKUkDBSDkMZCESmqD5TCq68wa7s+WUJBnovj8L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}