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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b016a63bd2461c6d655a499f36d6cecfe1b15056d023253ef85fde265f9b6dc' 
  AND token = 'CKA9GOO+sTdN4DYtScub2ohi9wuGC4f8ZFkntAxQexM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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