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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f13265c131a16b13852acf9d50cdf209f36b805a3c5203feef79c593ebe4b1' 
  AND token = 'm5T2vCdWLB6ZBDwpYudQz7X2ZL8jKiEnt7+XwrLq12o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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