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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27d654957790129088d2104207745afd0a5dfc09d891363fa8b728fde08f929' 
  AND token = 'YPNwNBX6lEMIMjtVDlO0RhuNqak3Koi97V/DiaYiWAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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