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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051d8761a5e8608ac93b4638854a90462502830a103f14c4662e225bca8b8175' 
  AND token = '/S+q61owPzfaoH8Y8eE31WZ6R46W6SeFKHtdDV6Pj5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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