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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5c74a3dd46438f5403a2bd33fb555c90ee55fe02de09a0b9c71dc2dad3e055' 
  AND token = '7gA1Fvq02/aQhGQPRtESR18dGA2MWmUzoBgc+sGlOBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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