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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd392612f9c899c99670b06a98fb751b9b34a9954e5c34c887a303b0570d0c0e2' 
  AND token = 'sKNI7JSsYTZDutVgGlT2TR49v6G4dz1dJzMgvaGnwNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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