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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ee55e40fe41b74d4329fe593f93130a96ae0000171a82a1eb86d56db6d5f5c' 
  AND token = 'xFGPjMUn0EHmkcXOv/lgBCwlUdXmtfdtttG9LtUd6z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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