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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a59fe37f1c5eead9c1c98788e9b6884c7929bb3fee2b11488f4c29b0e3ab9df' 
  AND token = 'YPkKlnR6NEjHq2suM0bDhXUqHYbHHEAPVh9xuwxnFnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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