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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84221d59d6c854ac33daa070ee6c522d5fad10af78f646b55da5de91efc7ea33' 
  AND token = '7UGc5EkB/phwEeVVAaCPR1sEdBv5Kj6znrX0HvTZEyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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