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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8c32f5a61f14b822797a6adfd2b543294d40e9d48e2e2c7c8283ff5ed9bfea' 
  AND token = 'oUc8DtMrnWyTWEbEwIQvfquQXBq/sNAiA1ZFVyK8dmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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