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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8519f0879ab6c5187110136acb217b5a01a422fcd71898ab3fb8d5cc9a33446c' 
  AND token = 'Cs+7IGMdbPdzD//Ob9H9wVTfnAMNkg3/MJjaTGdp89Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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