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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab17ff50cb8fde473b6787b0f319aa4cc7ca5eec77dbd585acb4f1e468aff23b' 
  AND token = 'B/8KupbmZw9K9B0Vdo0McXc6PleJIAv4M/9HD6JDqZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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