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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2e3ecab6cab10b95f62b7ca1d2a70c21a04db642833c1420fd79c2865485fc' 
  AND token = '+SukJwbq8A0HB7WG9qztOQxPp2BfkmuB5R6EVmwRuag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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