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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02f60911442a2e0b9c4d63a4237a10e85aaa74d1ae02107d97d87702f95613f' 
  AND token = '9zXVTnAb3+04hVMB7AoMO5h+pQX6n0XW3v4ObqHifyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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