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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c76465d5e7290363595d793ccf8603bcfc6db624ba3044c7d10078da3b6911' 
  AND token = 'VrPM20co+4WmqRLmub6KeH0Pl9oa2jYEvbnHQpk/uNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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