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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba241dc5bb9f523770345192bba29f6c867993b01eebd709dcf090ad5ab0be6' 
  AND token = '8T+1eujP42xsmEx/AEXfoIszo2Wo6VRhxm9xxfPr4sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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