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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136ffac1dd6b70d4b3272de18b57f122b29eb49f9dc8e7761ba7a54d9380a1e6' 
  AND token = 'KqUJ4hHqdxSEjRhs/7CMSs9RZvds5OcNgynKlLtCAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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