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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b99213a35254ea6724ec835c9ce428caf39718cc77661c51fe7e65a96e94d5' 
  AND token = 'O/wbeawTr4RjAwVG/9w8tiZgLkRCtMy4FSr1BQZgPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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