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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ddda10e55b86e1585a4b04eaa26b148fd0635ce4ae7e16f104eca6897abb5b' 
  AND token = 'YxBH9embs0trK2zzHTcKv0AnQ91oAbbdi/k5+vWZJao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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