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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3580388f1eb717658afe11dee208303af580c6aee01b07cc18a07f1b6937a17a' 
  AND token = 'zappuaAsmiL9dDar5kGHSGK2Zh6qZZJbDFpwOtLXZ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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