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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46783486cafc7af6efec68e2c2759a551a0b835b36a1c8359ca0a7815665ebeb' 
  AND token = 'n3w6cte4jq7unXQ8RCjcp43cmgpq+s4wfRe/dJ/WFX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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