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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a275e3213cb159c5b766a74f306f02fc0b8a91c70417d45fe4437c6221d3378' 
  AND token = 'a1rlW0jrwoxM6ZIK9RY2LGeQl0Gf5N4tGT7bhDz2g7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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