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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a240f13596c9d252335e3e95af4f8264a8294711b5ece3b144cf283d487d381' 
  AND token = 'dYkaHtXo3OOf67x9iBHrKddOUf/qa2Z3iR3XOd+yqfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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