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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec994aa258eb05e09d013f5e423dcbd9ca6d75b9f42954c26afcee02c699eae9' 
  AND token = '9ldqin+gE/eBvkKXMbzp9lAM1MToL285sLm++5pxwco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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