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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee8d0bcc15d108908bd0a53fa72e9dd1a1531140f27dd594f812f3e5260824d' 
  AND token = 'ouaglsCc+Z8hyDj8vIKx0Adx7VHXxXjt7SJxY6aEvy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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