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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9cb78ff1252c2c17b0a7aefc3814715241608d2fff0bc961514e32dae26ad' 
  AND token = 'c7OwrFQYWYxePR7NUDDjRQafLfwVJ4OnQYFKri5kLY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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