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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48adb8b5d1c6a37ce05e54503e0b9be3b391960cc700d7420a1823919bf6102e' 
  AND token = 'LEQI6LY4hdfbBNtJycCjWUbTHuRWarC0XAtQ9/3RobU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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