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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a97c1f6c741f9479675de4099cc0fb1726da1f58f67772a7b97a1bdd97b87a1' 
  AND token = '3ZAwqcJwejyQ83iEPHswZH4b4lDKMTIgJiV36MCscQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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