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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630eca6cfefe0c9a68b74ec3d5d2b9ffae8cb3ed5458a1707496a33b9338ff8b' 
  AND token = 'kN1gkQh3aZljAJl7UNWPFxxCt2gKXi9UACTMACnB9DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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