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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1d31b75e8539b4948e81ffc937216121b4985bae6f3991d93c290542c180df' 
  AND token = 'WwXrL2IMlg1cIPSj/nhY7djqT8dmMsgrgUC1pnV/1cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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