Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce17adab5a59cdd24aabbd2fbd5f0fd0547ee19a6940cbdde71afa266e51e27f' 
  AND token = 'IqSylazYjgP1Dl3AqOQuEVtyZ9Dapvm2L3i661L0bBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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