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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10854d1b86175db285fa3ddaa34e5403bf356623228e2d6869431a06ed5c6632' 
  AND token = 'WlMzczPzYk7DcrG3BfzEkZ0ETho53vdNKCen/8QFyzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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