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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61db119c66335f50f1db57a5950fe0e4e99b52e9cc6051bf293909aff847e28c' 
  AND token = 'IHn+KRE38D5PoJ68+XLzTvcYBvOOckM9Z1WOJuda+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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