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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85be8daa0b2acec16cf49fb0d8e3b9c88fd531b42d0cd5eacd7065af75f14eb' 
  AND token = 'g5VB5W1SpJMWKMPRK+IW6kpy64zbJ6erKMUdtxMwjdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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