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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e8fe53b844fe275067c63591c2b5a62bc9442fdd604b1d93e67ff4923efb22' 
  AND token = 'bYTbICB6peY3zDRi95oP2uRoHfb0Ra8fZMpR8jzD+sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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