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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1de56f41af15cc1367e3992c1352db791758edb725d207c6c3a6ebaca2c58a6' 
  AND token = 'xa7hTPvpaBaMxHZwaQsuJ/wrJX0D1LNyFNY6RJW1snA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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