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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb5b52ef0f33f58846649efdcb054b9f31232dbfb435c2ea1e6ce8ef5f467dc' 
  AND token = 'Tfxm104WKdV85bHLQplkywiO79Y7qKeBV+OqgVstIO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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