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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe830b88e3e77bbe18bb19145c1992dc1ae28801d4697c210dc04c937b62b93' 
  AND token = 'DxWuLnfpNH4mV+SFYF+9EgO+6Mt3V68DzXqiua3bJJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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