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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd062a1e9e17608f900df95520e4b4858cc32b811e5eb88ed15c670696aa64683' 
  AND token = 'zeCGgzVSDEw34UGjfulmAEEZk1pub3hCH8y4O71or2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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