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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc94a92f40a946664f2a6b85364e4c5814898c4f9f053b09ead8dcaca135a85b' 
  AND token = '1aZRXlFulfEG0dRHRWXvlByoS/bknSkyLJKh9XmZD+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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