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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6910102c3a9801d840807810093f9f9da7a729a0736c4c88d56b8b5237a5bb8c' 
  AND token = 'PlFOanM9ARTe/fkT+42gHPQJBgunzhfkgG7sBXgQhPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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