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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf6a43c14917b419802c7395cd31457cc7f09c7452486fd2b3f5c895a9c0303' 
  AND token = '84lYS3nlo6kBrbn0aNVwzqhZR+xztctPDJxAbWrFYqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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