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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f285102dc8996d6ae3c4ea47f89525e2facfcd58fbdeb7a322cc69f0d234b1' 
  AND token = 'L0OIM+1dkRVac5Er5YaQvcusMuHurfT96wfO8yE4+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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