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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a7a55596bb9c55c2614cc840189e452e6bb143174e887333a0bf0b5d0db514' 
  AND token = '5DYllHP8jjxCYff9jq0U2chvpYezf3GR1WcyR2TY08A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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