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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1480e7eaa5db7436e46f6303d6d2abd5e82f35ed4b687b13bc174dc2be667958' 
  AND token = 'Xj+iQNv6H/zo1klxVD+hcO0iG/Sw1adcyCsdyEcp3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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