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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793f7f0ed96e7d31c2acf0d9b4f0b3c488165db07bfe2dd4bd3c6e1b136751fc' 
  AND token = 'ZL5nHNSkCoREKiW1KdseiM/nc43+Jw3LtLl6aBoq/nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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