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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a73ce57355bcd848af0bdad705fa917a79a48ae0b88c0e8c96f0f0183e52e59' 
  AND token = 'MF9FX5OHaIYUOSJPbsdHj0+ps+pCzl5GIlv9wZvepnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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