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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc059ccdbf67e95438c506f2e67d2fe4a62beb5af8ed1f2c994ad42c699896b' 
  AND token = '2Mmhku23VDxaxPg8K7lWmDjuSqjKVWN87qJ0n9G1oyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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