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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa96b9272e0cf9d0839e0c6ff7bcb370db3bc82dee81e0d5c899f1ef5eb8153' 
  AND token = '5lWDWNn5a+S52gVVpN2KQIY2uDt4mS3kY7XI5dpOkSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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