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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41b061fa49002f12c5cb7930b502cc370b032e1faa7aca0f568b9ee89697483' 
  AND token = 'mgl5IJtgfnSfPgwYYixCZXHhSPQYj+PF0FA1hItTrTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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