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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c200d14477491960a801f75d907ab3cb6eabe6d30d5b67b38e560e7e71d34f8e' 
  AND token = 'kLhUQwafClwviZS+BJjLrEX6e4CZ/7itso0mpuvZeY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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