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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532094efb91e8683f6d60508e947c1fb06f8f1fc9cfdc3060c1a24b1610dbc85' 
  AND token = '3gvd2SLeR+DIkbWia+gkUmdvIMAxamMwGCFXEH0Dt04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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