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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b916f1c1ff44ac6041912112591572a16a5e606c7727456c67600903184f2a3d' 
  AND token = '4EKVkrOWfQjeG9EO4cTFpBPKTMHz8S8x9f5Vs6eXv1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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