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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82aac47804eddad5ebda0fbe9b9179645eabe5a2b37ef2d79f890f11c62128c3' 
  AND token = 'tgiQehb0zjgyOyVeiCFL50w849cRmkLXVmB2vZMl684=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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