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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a4f80a11bcc222c6acea49e47d5269a4c536e47a70cbead8b6c24ada8b8bca' 
  AND token = 'YuYHBoDNPGHdWYQhww3dfQ7whAt/P3dviQhpt6J+A/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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