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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efbee2559546d6cddd4ba0a42347600e2b0ca5d5a872e486487ed9150cad92a' 
  AND token = '96FRhGaAD5K+yCuUdoGLdWt+AwtT6sqd1dhjPsKMf6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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