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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771c36877d8dc8291b285df538cf632eb343eadf002ae0a6ad3470532e80f013' 
  AND token = '5CXMlNnDmNqI8scmZwzssY3OfQh/NX8kD2KNid9u5Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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