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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d1358a3f042e712661e1d7d602af13bad1293cdfd2f2bfc2b36588acc3b7f7' 
  AND token = '/yQ5SwKFDkCzNWRGA2SDnb/qtce8ga9TopasA0QbEOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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