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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f37c52b5fabf6ea2f9e23bb8b973caf269855427b5c023a69157446246e267c' 
  AND token = 'QFPQ1FYGML1pWUd6o6hSAm2t5s1Ta/Jm73qq43BOdu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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