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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbad66c5d4f79da0bcd9eb2a07a0d10b973b23dfc6cb95c2a4fa3c701296706' 
  AND token = 'nIxkauDXuY5oUrBa3mjxBpCMyhRp7rVldB8/iOYnh2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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