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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363dba00176081e44f60cf03927f437ec510ba48a7b89e49f48ce7009f97e783' 
  AND token = 'Pt0BPVBkmaM5fS/UQLzixHLNGJDyVspuNKHqD9GZ/40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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