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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b5f50095f30fdee19d9b75bab8596f2800f8b65326839ab261e97d956dfe05' 
  AND token = 'KQuDVYiPutuCDyw05revwNHymxvPVsxl7PW7N0hHodQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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