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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c9fe6184c976b2196420e28d2159cddfcb67fdbf3452eb9cf312cdb9a942b8' 
  AND token = '1238pwcIgXSXnLkf475MXdzv8ou1398zL940TipHKlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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