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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614b909b9be79189e0e40aeb39f78bdb15cff3299993f6de7ce6d36f1612c557' 
  AND token = 'zItGqbpl27NABWd9eq+o6X/NlM51qoIpLUqiRravgII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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