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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e51685ab076b9f9bb0c79b9d89d1c5b8069a64559f6c8f34b173fffeae8baeb' 
  AND token = '92gHWr+WZfWE6dTj6KiOUWae/ZHyr85JMxt6Ud4VkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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